Screw Grips

In screw grips the gripping force is applied manually or via an electric motor. These grips are used mostly for smaller test loads (from 20 N to max. 50 kN) and thinner specimens—fine wires, fibers, films.

Key Advantages and Features 

  • Gripping force depends on the screw torque and grip compliance
  • Very easy to operate
  • Large opening widths for flexibility in use
  • Most commonly used screw grips are U-shaped for good accessibility
  • Simple design principle enables standard version to be resistant to high temperatures
  • Depending on the type, these grips have an axial bearing in the gripping unit for increased gripping forces
  • Many screw grips feature free adjustment of both jaws, allowing asymmetrical specimens to be tested

Screw Grips 

Fmax 20 N 
  • Specimen material:
    Ferrous and non-ferrous metals, paper, plastics, insulating material, artificial leather, textiles, wood, similar materials
  • Specimen shape:
    Round specimens, strip specimens, flat specimens (foils) with or without reinforced gripping ends (dumbbells)
  • Type of loading:
    Tensile

Advantages and features

  • Simple handling
  • Lightweight construction
  • Jaws are already included in the system

Technical data, Fmax 20 N

Item No.

313348

Type

8153

Test load, max. (Fmax)

0.02

kN

Height

60

mm

Width

30

mm

Depth

32

mm

Opening width, max. with jaws

3

mm

Gripping of the specimen

The specimen must be gripped above at least 3/4 of the jaw height.

Weight of one specimen grip (with jaws), approx.

35

g

Connection

Ø 8

mm

Ambient temperature

-70 to +250

°C

Scope of delivery

2

pieces

Jaws supplied

Surface

Aluminum, smooth

Gripping area (H x W)

16 x 20

mm

Hardness

not hardened

Screw Grips 

Fmax 200 N
  • Specimen material:
    Yarns, thread, fine wires, metal strips, metallic ribbons, plastic tapes, similar materials
  • Specimen shape:
    Round specimens such as wires, flat specimens such as foils
  • Type of loading:
    Tensile

Advantages and features

  • Simple handling, good accessibility
  • Lightweight construction
  • Large clamping length and low contact pressure; ideal for clamping sensitive and notch-sensitive specimens
  • Includes centering aid for clamping threads or wires

Technical data, Fmax 200 N

Item no.

313308

Type

8131

Test load, max. (Fmax)

0.2

kN

Height

80

mm

Height with hand wheel

85

mm

Width

81

mm

Depth

30

mm

Depth with hand wheel

48

mm

Opening width, max. with jaws

2

mm

Gripping of the specimen:

The specimen must be gripped above at least 3/4 of the jaw height.

Weight per specimen grip (with jaws), approx.

400

g

Connector

Ø 8

mm

Ambient temperature

-70 to +250[1]

°C

Scope of delivery

2

pieces

  1. It is possible that the temperature range is limited by a smaller jaw temperature range.

Screw Grips

Fmax 200 N
  • Specimen material
    Ferrous and non-ferrous metals, metallic foils, wire, plastics, textiles, fleece, foam, paper, textiles, insulating material, artificial leather, and similar materials
  • Specimen shape
    Round and flat specimens (strips and dumbbells), asymmetrical specimens, sealed and glued specimens
  • Type of loading
    Tensile

Function description

This screw grip consists of a lightweight yet stiff base.

The clamping unit (lead screw) with the handwheel is used to open, close, and the generate closing force. The clamping unit can always be adjusted step by step.

The opposing jaw of the screw grip that can be adjusted step by step is permanently mounted, but the gripping range can be adjusted with a tool in 1-mm stages. The specimen grips are factory set to a specimen thickness of 0 mm.

You can set the stepless grip insert of the stepless and step-by-step adjustable screw grip to half specimen thickness. The closing force is generated via the gripping wheel. The opening width can be adjusted from 0 to 10 mm.

Advantages and features

  • Adjustable opposing jaws allows eccentric specimen insertion, enabling asymmetrical gripping of specimens.
  • The specimen grips are very easy to operate.
  • The jaws can be interchanged without tools. They are simply inserted in the jaw mounting and automatically secured by a locating spring.
  • The large opening width enables flexibility in use.
  • High gripping force is achieved through an axial bearing in the clamping unit.
  • The low weight allows the use of load cells with smaller nominal forces.
  • Virtually symmetrical weight distribution prevents transverse forces to be applied to the load cell.
  • Very short clamping lengths can be accommodated due to the special geometry of the screw grip and the protruding jaws.
  • Specimen and component ends that are difficult to access can be gripped with the jaw overhang.
  • The U-design provides good accessibility to the screw grip and offers ample space for flexible specimen ends.
  • High temperature resistance (-70 to +250 °C) makes screw grips ideal for use in temperature chambers.
  • The connector has several retaining holes so that the screw grip can be mounted at 45° and 90°.

Technical data, Fmax 200 N

Item No.

025959

032334

025960

032335

Type

8033

8033

8033

8033

Test load, max. (Fmax)

0.2

0.2

0.2

0.2

kN

Height

60

60

60

60

mm

Width

98 to 108

98 to 108

111 to 119

111 to 119

mm

Depth

20

20

20

20

mm

Standard opening width, max.[1]

18

18

18

18

mm

Weight per specimen grip (without jaws), approx.

147

147

172

172

g

Connection

Ø 8

Ø 8

Ø 8

Ø 8

mm

Ambient temperature

-70 to +250[2]

-70 to +250[2]

-70 to +250[2]

-70 to +250[2]

°C

Scope of delivery

2

1

2

1

piece

  1. The standard opening width is a result of using jaws with 4-mm jaw strength and an outwardly adjusted jaw and opposing jaw. If only the opposing jaw is outwardly adjusted (adjustment range up to 9 mm), the maximum opening width is 14 mm.
  1. It is possible that the temperature range is limited by a smaller jaw temperature range.

Screw Grips 

Fmax 500 N
  • Specimen material:
    Paper, plastic, metal
  • Specimen shape:
    Flat specimens, strip specimens
  • Type of loading:
    Tensile

Advantages and features

  • Screw grips are easy to handle.
  • Specimens can be easily gripped due to the forward facing open design and the ergonomically designed height-adjustable crosshead.
  • The basic body of the screw grips are designed to serve as an automatic limit stop for 15-mm strip specimens.
  • Jaws are already included in the system.

Technical data, Fmax 500 N

Item No.

313320

313322

Type

8132

8132

Test load, max. (Fmax)

0.5

0.5

kN

Height

88.5

88.5

mm

Width

77

77

mm

Depth

44

44

mm

Specimen width, max.

15

15

mm

Opening width, max.

3

3

mm

Gripping of the specimen

The specimen must be gripped above at least 3/4 of the jaw height.

The specimen must be gripped above at least 3/4 of the jaw height.

Weight per specimen grip, approx.

0.25

0.25

kg

Connection

Ø 8

Ø 8

mm

Ambient temperature

-70 to +250

-15 to +80

°C

Scope of delivery

2

1

piece

Jaws supplied

Surface

Steel, smooth

Vulkollan, smooth

Gripping area (H x W)

23 x 16

23 x 16

mm

Hardness

200 HB

95 Shore A

Screw Grips

Fmax 1 kN 
  • Specimen material:
    Ferrous and non-ferrous metals, metallic foils, wire, plastics, foam materials, paper, fleece, insulating material, wood, textiles, artificial leather, and similar materials
  • Specimen shape
    Round and flat specimens (strips and dumbbells), asymmetrical specimens
  • Type of loading
    Tensile, compression, alternating load

Advantages and features

  • Large opening widths offer flexibility
  • Adjustable opposing jaws allows eccentric specimen gripping, enabling asymmetrical gripping of specimens.
  • A range of jaws ensures optimum matching to test material: Various materials, surface structures and gripping surface sizes are available.
  • High gripping force is achieved through the axial bearing and gear ratio in the clamping unit.
  • Jaws can be changed without tools. Easy side insertion into specimen grip and centering and fixing of jaws follow automatically.
  • Prestressed spring disk induces automatic retightening in smaller areas. Specimens with lower thickness reduction can also be gripped securely over the course of the entire test.
  • High temperature resistance (-70 to +250 °C) is ideal for use in temperature chambers.
  • Simple handling.
  • The U-design provides good accessibility to the screw grip and offers ample space for flexible specimen ends.
  • Optional centering stop is easily adjustable to specimen width/diameter and enables centered clamping of specimens.

Technical data, Fmax 1 kN

Item no.

316264

317660

Type

8133

8133

8133

8133

8133

8133

Test load, max. (Fmax)

1

1

1

1

1

1

kN

Height:

Without overhang

85

85

85

85

85

85

mm

With overhang

95

95

95

95

95

95

mm

Width

163 to 183

163 to 183

163 to 183

163 to 183

195 to 215

195 to 215

mm

Depth:

Without hand wheel

32

32

32

32

32

32

mm

With hand wheel

50

50

50

50

50

50

mm

Standard opening width, max. (with jaws)

18[1]

18[1]

18[1]

18[1]

18[2]

18[2]

mm

Gripping of the specimen

The specimen must be gripped above at least 2/3 of the jaw height.

The specimen must be gripped above at least 2/3 of the jaw height.

The specimen must be gripped above at least 2/3 of the jaw height.

The specimen must be gripped above at least 2/3 of the jaw height.

The specimen must be gripped above at least 2/3 of the jaw height.

The specimen must be gripped above at least 2/3 of the jaw height.

Weight per specimen grip, approx.

0.55

0.55

0.67

0.67

0.63

0.81

kg

Connection

Ø 8

Ø 8

Ø 20

Ø 20

Ø 8

Ø 20

mm

Ambient temperature

-70 to +250[3]

-70 to +250[3]

-70 to +250[3]

-70 to +250[3]

-70 to +250[3]

-70 to +250[3]

°C

Scope of delivery

2

1

2

1

2

2

piece

  1. This standard opening width is a result of using jaws with 5-mm jaw strength and an opposing jaw that is outwardly adjusted by 9 mm. This is also the maximum specimen thickness for symmetrically gripped specimens.
  1. This standard opening width is a result of using jaws with 5-mm jaw strength and an opposing jaw in its initial position (= adjustment marks coincide).
  1. It is possible that the temperature range is limited by a smaller jaw temperature range.

Screw Grips 

Fmax 2.5 kN
  • Specimen material:
    Ferrous and non-ferrous metals, metallic foils, wire, plastics, foam materials, paper, fleece, insulating material, wood, textiles, artificial leather, and similar materials
  • Specimen shape
    Round and flat specimens (strips and dumbbells), asymmetrical specimens
  • Type of loading
    Tensile, compression, alternating load

Advantages and features

  • Large opening widths offer flexibility.
  • Adjustable opposing jaws allows eccentric specimen gripping, enabling asymmetrical gripping of specimens.
  • A range of jaws ensures optimum matching to test material: Various materials, surface structures and gripping surface sizes are available.
  • Jaws can be changed without tools. Easy side insertion into specimen grip and centering and fixing of jaws follow automatically.
  • High gripping force is achieved through the axial bearing and gear ratio in the clamping unit.
  • Prestressed spring disk induces automatic retightening in smaller areas. Specimens with lower thickness reduction can also be gripped securely over the course of the entire test.
  • High temperature resistance (-70 to +250 °C) is ideal for use in temperature chambers.
  • Simple handling
  • The U-design provides good accessibility to the screw grip and offers ample space for flexible specimen ends

Technical data, Fmax 2.5 kN

Item No.

316322

316406

317656

Type

8253

8253

8253

Test load, max. (Fmax)

2.5

2.5

2.5

kN

Height:

Without overhang

95

95

95

mm

With overhang

100

100

100

mm

Width

196 to 216

196 to 216

201 to 221

mm

Depth:

Without hand wheel

32

32

32

mm

With hand wheel

50

50

50

mm

Standard opening width, max. (with jaws)

18[1]

18[1]

18[2]

mm

Gripping of the specimen

The specimen must be gripped above at least 2/3 of the jaw height.

The specimen must be gripped above at least 2/3 of the jaw height.

The specimen must be gripped above at least 2/3 of the jaw height.

Weight per specimen grip, approx.

1.2

1.2

1.3

kg

Connection

Ø 20

Ø 20

Ø 20

mm

Ambient temperature

-70 to +250[3]

-70 to +250[3]

-70 to +250[3]

°C

Scope of delivery

2

1

2

piece

  1. This standard opening width is a result of using jaws with 5-mm jaw strength and an opposing jaw that is outwardly adjusted by 9 mm. This is also the maximum specimen thickness for symmetrically gripped specimens.
  1. This standard opening width is a result of using jaws with 5-mm jaw strength and an opposing jaw in its initial position (= adjustment marks coincide).
  1. It is possible that the temperature range is limited by a smaller jaw temperature range.

Screw Grips

Fmax 5 kN 
  • Specimen material:
    Plastics, textiles, fabrics, foils, papers, bands, fleece, wood, insulating material, artificial leather, and similar materials
  • Specimen shape:
    Round and flat specimens (strips and dumbbells), asymmetrical specimens
  • Type of loading:
    Tensile

Advantages and features

  • Jaws are already included in the system.
  • Simple handling
  • A large opening width enables a flexible range of application
  • The U-design provides good accessibility to the screw grip

Technical data, Fmax 5 kN

Item No.

320436

Type

8354 PL[1]

Test load, max. (Fmax)

5

kN

Height

125

mm

Width

225

mm

Depth

60

mm

Opening width, max.

25

mm

Gripping of the specimen

The specimen must be gripped above at least 3/4 of the jaw height.

Weight per specimen grip, approx.

3.8

kg

Connection

Ø 20

mm

Ambient temperature

+10 to +35

°C

Scope of delivery

1

piece

Jaws supplied

Surface

Vulkollan, smooth

Gripping area (H x W)

50 x 60

mm

Hardness

95 Shore A

  1. PL = ProLine

Screw Grips

Fmax 10 kN 
  • Specimen material:
    Metallic foils, wire, plastics, textiles, artificial leather, insulating material, paper, wood (solid, non-yielding materials)
  • Specimen shape:
    Round and flat specimens (strips and dumbbells), asymmetrical specimens
  • Type of loading:
    Tensile, compression, alternating load

Advantages and features

  • Jaws can be changed without tools. Easy side insertion into specimen grip and centering and fixing of jaws follow automatically.
  • High temperature resistance (-70 to +250 °C) is ideal for use in temperature chambers.
  • Integrated jaw mounting.
  • An increased gripping force is achieved through axial in the clamping unit.

Technical data, Fmax 10 kN

Item No.

320440

Type

8354 PL[1]

8354

Test load, max. (Fmax)

10

10

kN

Height

125

125

mm

Width

225

233

mm

Depth

60

60

mm

Standard opening width, max. with jaws

25

25[2]

mm

Gripping of the specimen

The specimen must be gripped above at least 3/4 of the jaw height.

The specimen must be gripped above at least 3/4 of the jaw height.

Weight per specimen grip, approx.

3.9

7

kg

Connection

Ø 20

Ø 20

mm

Ambient temperature

+10 to +35

-70 to +250[3]

°C

Scope of delivery

1

2

piece

Jaws supplied

Surface

Steel, pr[4] 0.7

not supplied

Gripping area (H x W)

50 x 60

not supplied

mm

Hardness

61 HRC

not supplied

  1. PL = ProLine
  1. This standard opening width is the result of using jaws with 5-mm jaw strength.
  1. It is possible that the temperature range is limited by a smaller jaw temperature range.
  1. Pr = pyramid grid

Grips for insulating materials 

Fmax 10 kN

The grips for insulating materials are designed for standard-compliant testing of insulating materials to DIN 18164 Part 1 and DIN 18165 Part 1.

The closing force is applied via a screw unit. The specimen grip is opened and closed via a hand crank.

Jaws with pins are available for the specimen grips. They are pressed into the specimen during gripping, applying the tensile forces in this manner. Flat jaws with serrated steel surfaces can be used in special cases.

Advantages and features

  • The clamping distance is symmetrical to the tensile axis. This is advantageous because the specimen is not subject to bending moments.
  • Secure gripping is ensured by protruding pins located in the jaws.
  • A support grip located in the center of the screw grips facilitates gripping and vertical alignment of the specimen.

Technical data, Fmax 10 kN

Item No.

318405

318407

Type

8330

8330

Test load, max. (Fmax)

10

10

kN

Width

256

370

mm

Width with hand wheel

366

480

mm

Height

234

244

mm

Depth

500

500

mm

Opening width/specimen thickness

See jaws

See jaws

Weight per specimen grip, approx.

30

32

kg

Connection

Ø 20

Ø 20

mm

Ambient temperature

0 to +50

0 to +50

°C

Scope of delivery

2

2

piece

Screw Grips

Fmax 20 kN 
  • Specimen material
    Ferrous and non-ferrous metals, metal foils, wire, plastic, textiles, artificial leather, insulating material, foam, fleece, paper, wood (rigid, non-flowing materials).
  • Specimen shape
    Round and flat specimens (strips and dumbbells), asymmetrical specimens
  • Type of loading
    Tensile

Advantages and features

  • High temperature resistance (-70 to +250 °C) is ideal for use in temperature chambers.
  • Integrated jaw mounting.
  • An increased closing force is achieved through the axial bearing in the clamping unit.
  • Jaws can be changed without tools. Easy side insertion into specimen grip and centering and fixing of jaws follow automatically.

Technical data, Fmax 20 kN

Item no.

318591

Type

8355

Operating principle/identification

Opposing jaw can be adjusted steplessly

Test load, max. (Fmax)

20

kN

Height

155

mm

Width

250

mm

Depth

60

mm

Standard opening width, max. with jaws

25[1]

mm

Gripping of the specimen

The specimen must be gripped above at least 3/4 of the jaw height.

Weight per specimen grip (without jaws), approx.

8

kg

Connector

Ø 36

mm

Ambient temperature

-70 to +250[2]

°C

Scope of delivery

2

pieces

Jaws supplied

Jaws supplied

Not supplied

Gripping area (H x W)

-

Hardness

-

  1. This standard opening width is the result of using jaws with 5-mm jaw strength.
  1. It is possible that the temperature range is limited by a smaller jaw temperature range.

Screw Grips

Fmax 30 kN and Fmax 50 kN
  • Specimen material
    Ferrous and non-ferrous metals, hard and reinforced plastics, wood, textiles, paper, and similar materials
  • Specimen shape
    Round and flat specimens (strips and dumbbells), asymmetrical specimens
  • Type of loading
    Tensile

Technical data, Fmax 30 kN and Fmax 50 kN

Item No.

325314

Type

8451

8451

Test load, max. (Fmax)

30

50

kN

Height

130

130

mm

Width

108

108

mm

Depth

139

139

mm

Adjustability of the opposing jaw

None

None

Opening width with jaws, max.

10

10

mm

Gripping of the specimen

The specimen must be gripped above at least 3/4 of the jaw height.

The specimen must be gripped above at least 3/4 of the jaw height.

Weight of one specimen grip (without jaws), approx.

6

6

kg

Connection

Ø 36

Ø 36

mm

Ambient temperature

-70 to +250[1]

-70 to +250[1]

°C

Scope of delivery

2

2

piece

  1. It is possible that the temperature range is limited by a smaller jaw temperature range.

Screw Grips

Fmax 50 kN 
  • Specimen material
    Ferrous and non-ferrous metals, wire, hard and reinforced plastics, wood, textiles, artificial leather, insulating material, paper, and similar materials
  • Specimen shape
    Round and flat specimens (strips and dumbbells), asymmetrical specimens
  • Type of loading
    Tensile

Technical data, Fmax 50 kN

Item No.

313626

Type

8455

Operating principle/identification

Fixed opposing jaw

Test load, max. (Fmax)

50

kN

Height

170

mm

Width

200

mm

Depth

213

mm

Opening width, max. with jaws

25

mm

Gripping of the specimen

The specimen must be gripped above at least 3/4 of the jaw height.

Weight per specimen grip (without jaws), approx.

20.3

kg

Connection

Ø 36

mm

Ambient temperature

-70 to +250[1]

°C

Scope of delivery

2

pieces

  1. It is possible that the temperature range is limited by a smaller jaw temperature range.
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